限制泛型可用类型

public class LimitClass<T extends List> {
    
    public static void main(String[] args) {
        LimitClass<ArrayList>l1  = new LimitClass<ArrayList>();
        LimitClass<LinkedList>l2 = new LimitClass<LinkedList>();
        
        //LimitClass<HashMap> l3 = new LimitClass<HashMap>(); HashMap没有实现list()接口
    }
}